Method and apparatus to compensate for image artifacts caused by magnet vibration in an MR imaging system

(19)

(11)

EP 1 102 081 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	28.05.2003 Bulletin 2003/22

(43)	Date of publication A2:
	23.05.2001 Bulletin 2001/21

(21)	Application number: 00310012.0

(22)	Date of filing: 10.11.2000

(51)	International Patent Classification (IPC)⁷: G01R 33/38, G01R 33/565

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

22.12.1999 US 468960
22.12.1999 US 469864
15.11.1999 US 165523 P

(71)	Applicant: GENERAL ELECTRIC COMPANY
	Schenectady, NY 12345 (US)

(72)	Inventor:
	Zhou, Xiaohong Houston, Texas (US)

(74)	Representative: Goode, Ian Roy et al
	GE LONDON PATENT OPERATION, Essex House, 12/13 Essex Street London WC2R 3AA London WC2R 3AA (GB)

(54)	Method and apparatus to compensate for image artifacts caused by magnet vibration in an MR imaging system

(57) A magnetic resonance (MR) imaging system for reducing image artifacts caused by magnet vibration. The system includes a magnetic field vibration quantification (604-610) and compensation (614-620) scheme including correcting for a vibration error induced in k-space data corresponding to an MR image. The vibration error can be at least one of a spatially independent phase error (604) caused by a spatially invariant magnetic field, a k_x-space displacement error (606) caused by a perturbation gradient along the readout direction, a k_y-space displacement error (608) caused by a perturbation gradient along the phase-encoding direction, and a slice-selection error (610) caused by a perturbation gradient along the slice-selection direction. The vibration error is used to appropriately modify (614-620) and/or add to its corresponding magnetic field component, or its equivalent, in the pulse sequence.

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